Ventilator



April 14, 1942- w. F. HlRscHMAN 'l 2,279,620

VVENTILATOR Filled Nov. 2*, 1938 2 Slieekts-Sheet l 2;\

y i 72 [L Mh y "Illu". Tip/7g A? X' i INVENTOR April 14, 1942.v W FHlRscHMAN 2,279,620

VENTILATOR Filed Nov. 2, 1938y 2 Sheetsl-Shee' 2 INVENTOR ATTORNEY Q6 25fg if zu Patented pr. 1 4, i942 VENTILATOR William F. Hirschman, Buial,N. Y., assigner to W. F. Hirschman Co., Inc., Buffalo, N. Y., a.corporation of New York Application November 2, 1938, Serial No.A238,433

(Cl. 23o-117) 9 Claims.

ated parts `are protected` from the impurities present in the airWithdrawn from the room, or rooms, of the building with which theventilator communicates, this object contemplating the mounting of themotor in a vcompartment which isolates it from the said air.

A further object is to guard against entry of Water of condensation intothe motor compartment.

A still further object is a ventilator in which provision is made forcooling the motor with fresh air. Y

A still further object is a novel construction and arrangement of theparts of the ventilator, whereby to achieve simplicity in design andefficiency in operation.

The invention is illustrated in the accompanying drawings in which:

- Figure 1 is a perspective view of a ventilator embodying the featuresof the invention;

Figure 2 is an enlarged elevational View thereof, partially in section;

Figure 3 is a horizontal section taken along line 3 3 of Figure 2;

Figure 4 is a vertical section taken along line 4 4 of the same gure;

Figure 5v is a longitudinal section throughV the motor compartment andillustrates a rnodiiiedV form of the invention;

Figure 6 isa similar section illustrating an'- other embodiment of theinvention.

The ventilator, as illustrated, is, to outward appearances, ofconventional design and includes a head I5, a neck II and a base I2, thelatter tting over, and being suitably' secured to, a curb I3 which isformed or provided upon the roof or deck of a building. The fan by whichthe air is exhausted from the room, or rooms, with which theventilator'communicates is indicated at I4.

In accordance with the invention the electricmotor I5 by Which the fanis driven is mounted in a compartment I6. The latter is provided by arectangularly shaped housing I'IWhichv is mounted in the neck II uponangle members I8, said members supporting said housing so that itextends from one end which abuts the wall of the neck toward, and ashort distance beyond, the axial center of the neck. The housing, asillustrated, comprises inner and outer shells I9 and 2i), respectively,which are spaced to provide a heat insulating chamber 2|, the latterpreferably being filled with a suitable insulating material. It isunderstood, of course, that inthe event thatthe insulating properties ofthe Walls of the housing are unimportant a single 'shell constructionmay be employed.

The fan I4 is fixed to the upper end of a drive shaft 22, the axis ofthe latter preferably coinciding with that of the neck I I. Thelower'end of the shaft is mounted in an upright bearing standard 23, theupper end of the shaft extending through an opening 24 formed in the topwall of the housing. The bearing standard 23 is suitably secured to abase 25. The latter, asbest shown in Figure 4, is channel-shaped incrosssection and has a plate 21 secured to one of its legs 26. The saidplate provides a mounting for the motor I5, the driveV pulley 28 of themotor` being connected to a companion pulley 29 Xefd to the drive shaft22 by a belt 30. Thefbase 25 is supported upon the bottom Wall of thecompartment I 6 by the legs 26 and is secured against lengthwisemovement by bolts 3|. Preferably they top Wall of the housing I'l isformed' with an' annular shoulder 32 which is adapted to prevent v'vaterof condensation from entering the coipartment through the opening 24,

In order to provide for cooling of the motor' I5 an opening 33 is formedin the neck Il of the ventilator, the said opening being formed in thatportion of the neck against which the open end of the housing I1 abutsand being partially closed by a door 34. The latter is formed adjacentits base with a louver 35 through which air is per-1 mitted to entervthe compartment I3. In this connection it will be noted that the openingv24v through which the drive shaft of the fan passes is large enough tokprovide a substantial clearance around the said shaft, whereby toprovidean outlet through which air may pass from the compartment I6.

During operation of the fan I4 air is exhaustedv from the room, orrooms, with which the venti-- lator communicates, the said air passingaroundA the housing I1 and being expelled from the hood.' At the sametime, owingv to suction above the' opening 24, fresh air is caused toenterv the com-` partment I6, this air owing over the motor I5v to coolit and escaping through the opening 24 to enter the main body of airpassing up through the neck II. From the foregoing it will be apparentthat the motor I5, belt 30 and associated parts are protected from theair bearing the dust, gases and other impurities. None of this air ispermitted to enter the compartment I6 through the opening 24, owing tothe higher pressure in the compartment, and the continuous stream offresh air which is discharged through the opening during operation ofthe fan. Injury to the motor, fan belt and associated parts is thusprevented. The motor, however, despite its isolation from the main bodyof air passing through the ventilator is cooled effectively by thestream of fresh air Which is caused to flow through the compartment I6,it being noted that the motor is located in close proximity to `thelouver 35 and hence receives the benet of the air while in its cooleststate.

In the embodiment shown in Figure 6 the outer shell 2B of the housing IIis formed with a lip 36. The latter projects above the top wall andco-operates with a disc 31 which is secured to the drive shaft 22 andwhich is formed with a peripheral flange 38. The said lip and'discprovide a tortuous path for the cooling air which passes through thecompartment I6 and serve not-only toprevent water of condensation, whichmay accumulate upon the top of the housing, from entering thecompartment but also to prevent entry of any such water which may dripfrom the interior of the hood toward the opening 24. In other respectsthe construction is similar to the embodiment first described.

The embodiment shown in Figure 5 is similar to that shown in Figure 6 inthe respect that a lip 36 is formed around the opening 24. In thisinstance, however, a modified form of fan is em-vr ployed. The said fan,as illustrated, includes main blades 39 and auxiliary blades 40, all ofwhich are carried by a central disc 4I. The latter covers the opening 24and hence also serves to prevent water of condensation from drippinginto the comparement I6. The auxiliary blades are formed, or provided,upon the under side of the disc and 'they induce a flowof fresh airthrough the compartment to cool the motor in the manner described. Inother words the auxiliary blades supplement the action of the mainblades.

In addition to the advantages above noted, the various embodimentsillustrated have the further advantages that facility in assembling theparts is promoted; and simplicity in construction and economy inoperation are insured.

I claim as my invention:

1. An air exhausting unit for a ventilator including a housing which is`supported horizontally in a vertical flue and which is formed with anair inlet opening in an end Wall and an air outlet opening inaJ topwall, a fan located in said flue above said housing for withdrawing airfrom the space with which the flue communicates, a supporting frame insaid housing, a motor mounted on said frame adjacent said air inletopening, an entrance to said housing from the exterior of said iiuethrough which access may be` had to said motor, a vertical shaft drivenby said motor and in turn driving said fan, said s haftbeing co-axialwith said flue and extending through the air outlet opening and abearing mounted on said frame below the outlet opening in which thelower end of said shaft is rotatablyV in said housing for driving saidshaft and a. cover-piece carried by said shaft exteriorly of thehousing, said cover-piece overlying said air outlet to prevent entry ofwater through it into the housing but being spaced from the latter sothat the fanA also induces a flow of air through the housing to coolsaid motor.

3. An air exhausting unit for a ventilator including a housing which issupported horizontally in a vertical flue and which is formed with airinlet and outlet openings, a fan located in said flue above said housingfor withdrawing air from the space with which the ue communicates, avertical shaft for driving said fan, said shaft being co-axial with saidflue and extending through the air outlet opening, a motor mounted insaid housing between said air inlet and outlet openings for driving saidshaft and a cover-piece carried by said shaft exteriorly of the housing,saidvcover-piece overlying the outlet opening to prevent entry of waterthrough it into the housing but being spaced from the latter so that thefan also induces a flow of air through the housing to cool said motor.

4. An air exhausting unit for a ventilator including a housing which issupported horizontally in a vertical iiue and which is formed with airinlet and outlet openings, a fan located in said iiue above said housingfor withdrawing air from the space with which the flue communicates, avertical shaft for driving said fan,said shaft being co-axial with saidflue and extending through the air outlet opening, a bearing located insaid housing below the air outlet opening and in which the lower end ofsaid shaft is rotatably supported, a motor mounted in said housingbetween said air inlet and outlet openings for driving said shaft and acover-piece carried by said shaft exteriorly of the housing, saidcover-'piece overlying the air outlet opening to prevent entry of waterthrough it into the housing but being spaced from the latter so that thefan also induces a ow of air through the housing to cool said motor.

5. An air exhausting unit yfor a ventilator including a housing which issupported horizontally in a vertical ue and which is formed with airinlet and outlet openings, an entrance to said housing from the exteriorof saidfiue, a fan located in said yflue above said housing forwithdrawing air from the space with which the flue communicates, asupporting frame in said housing, a motor mounted on said frame adjacentsaid air inlet opening, an entrance to said housing from the exterior ofsaid ue through which access may be had to said motor, a vertical shaftdriven by said motor and in turn driving said fan, said shaft beingco-axial with said flue and extending through the air outlet opening, abearing mounted on said frame below the air outlet opening and in whichthe lower end of said shaft is rotatably supported and a cover-piececarried by said'shaft exteriorly of the housing, said cover-pieceoverlying the air outlet opening to prevent entry of water through itinto the housing but being spaced from the latter so that the fan alsoinduces a iiow of air through the housing to cool said motor.

6. An air exhausting unit for a ventilator including a housing which issupported horizontally in a vertical nue and which is formed with airinlet and outlet openings, a fan located in said flue exteriorly of saidhousing, said fan having a set of large blades for withdrawing airaround said housing from the space with which the iiue communicates, aVertical shaft for driving said fan, said shaft being co-axial with saidue and extending through the air outlet opening and a motor in saidhousing for driving said shaft, said fan having a set of small bladeswhich are located over and in close relation to the outlet opening sothat they induce a fiow of air through the housing to cool said motor.

7. An air exhausting unit for a ventilator including a housing which issupported horizontally in a vertical i'lue and which is formed with airinlet and outlet openings, a fan located in said ilue and above saidhousing, said fan having a set of large blades for withdrawing air fromthe space with which the ue communicates, a cover-piece which overliesthe air outlet opening, a vertical shaft for driving said fan, saidshaft being co-axial with said flue and extending through the air outletopening and a motor in said housing for driving said shaft, said fanhaving a set of small blades which are located under said cover-pieceand in close relation to the outlet opening so that they induce a flowof air through the housing to cool said motor.

8. An air exhausting unit for a Ventilator including a housing which issupported horizontally in a vertical flue and which is formed with anair inlet opening in an end wall and an air outlet opening in a topwall, a fan located in said flue above said housing for withdrawing v:El

air from the space with which the flue communicates, a supporting framein said housing, a vertical member mounted at one side of said frame atthe end adjacent said air inlet opening, a motor mounted on said memberand supported over said frame, said motor having a drive pulley, anentrance to said housing from the exterior of said flue through whichaccess may be had to said motor, a vertical shaft driven by said motorand to the upper end of which said fan is fixed, said shaft beingco-axial with said iiue and extending through said Iair outlet opening,a driven pulley xed to said shaft within said housing, a bearing mountedon said frame below the air outlet opening and in which the lower end ofsaid shaft is rotatably supported, a belt connecting said driving anddriven pulleys and a coverpiece fixed tor said shaft which overlies theair outlet opening to prevent entry of water through it into the housingbut which is spaced from the latter so that the fan also induces a ow ofair through the housingto cool said motor.

9. An air exhausting unit for a ventilator vinv from the space withwhich the flue communi- Cates, a shaft for driving said fan, said shaftextending through said outlet opening and axially of said ue, said fanbeing adapted to in. n

duce a flow of air through said compartment to cool said motor andmeans, which normally closes the open end of said housing and which isaccessible from the exteriorof said iiue, for providing admission tosaid compartment to enable servicing of said motor and fan.

WILLIAM F. HIRSCHMAN.

